The Legs of Atem is an artifact pair of diamond desert leggings that increase the mobility of their wearer. They are obtained from a pharaoh's sarcophagus or very rarely from a lootable crate or chest.
Divine Agility increases your movement speed while worn. This impacts your walking, running, and swimming speeds.
The movement speed offered by the Legs of Atem is useful in just about any situation, particularly when exploring the vast biomes and sands of Atum or escaping particularly quick foes.